Question

Cerebrospinal fluid in humans is present in the _______________ space.

• A. subdural
• B. subarachnoid
• C. epidural
• D. pericardial

Hint:

Remember the order of the meninges from outside in: Dura, Arachnoid, Pia (DAP). CSF flows in the "subarachnoid" space, which is below the arachnoid layer.

Answer 1

The Correct Option is B

Step 1: Concept:
The brain and spinal cord are covered by three protective membranes called meninges: dura mater, arachnoid mater, and pia mater.
Step 2: Location of Cerebrospinal Fluid (CSF):
The space between the arachnoid mater and pia mater is known as the subarachnoid space. This space is filled with cerebrospinal fluid (CSF), which provides cushioning, protection, and nutrient transport for the central nervous system.
Step 3: Elimination of Other Options:

• Subdural space is a potential space between dura and arachnoid.
• Epidural space lies outside the dura mater.
• Pericardial space is related to the heart, not the brain.

Final Answer: CSF is present in the subarachnoid space.